| Based on the investigation of the social economy and natural environment of Qian county experiment area, summarizing research results of personnel of the task group, with the main methods of GIS and the technology of Objected Programming, combing with my principium research on theory and application of watershed spatial database, attribute database and land evaluation, studied the establish technology on regional land resource information database; exploited the land resource dynamic monitoring information that is applicable to Qian county experiment area; and used the information system as the basic data resource on the application research of land resource dynamic monitoring and evalution. Research results were as follows:1. Taking GIS software (ARC/INFO and ArcView) and Visual Foxpro as basic plat, protracted the system maps of land resource, those basic subject maps included land use status map, land types map, soil types map, grade map and soil organic substance map, combing with former summarizing research results, built the spatial basic database of land resource; based the spatial database, by the means of attribute table manipulation and take the map plot as basic unit to get the subject attributes of basic information, combined with social economy attribute information, built the attribute database; take the spatial basic database as basic work, by the means of vector piles to get the land resource dynamic movement system maps, included land use status , land types and soil organic substance dynamic movement map.2.Based on the built spatial and attribute database and the basic plat of Visual Foxpro, by the technology of Objected Programming, designed and built the land resource dynamic monitor information system (LRDMIS) for applied. The system is compose of modules which form superior to subaltern and can be extended easily, so it is a good data resource for user to get the land resource dynamic movement information in Qian county experiment area This system has integrity ability of data manage, it can carry through update and edit of data at any moment, it has main functions such as: browse and record attribute data, look over and graph manage of spatial database, graph edit, query and search of database, renew correlation export intellective. And it has such characters: the interface to user is friendly, developed in advancing technology, great at practicability, and it can be extended easily.3.Take the LRDMIS as info source to discuss the combination of GIS and specialty model in information system, by the means of spatial overlay analysis the land use status movements, carried a analysis to number and quality structure of region land type by the means of landscape analysis, and principal analysis was utilized to evaluate experiment area's land quality hierarchy., all the work provided a scientific foundation and technological support for experiment area synthetic management and planning.4. The results show that during the 1990-1995, the land use type mainly is infield and garden in Qian county experiment area, the land use structure is changing all the time and the rate of annual change is 16.49%, in which the infield and grassland decrease 8.40% and 2.55% while the garden and forest increase 7.43% and 2.29%; the type of land use type changing is mainly infeile and grassland to garden and forest, in which 68.43 hm2 infield chang to garden, 5.74 hm2 infield chang to forest, and 19.19 hm2 grassland chang to forest. The analysis on structure of land type show that the land structure is very complicated, landform is crash, land type is various, each area has great differences The platform land type area is 77.36 percent of total area and it is predominate. Based the result of land evalution, the total land quality is not high, the first class land which suitable to develop planting enterprise and can be use continues is very small, and it is only 0.38 percent of total area; the second and third class land which should be rebuild for some restrict factors is more, it is 71.85 percent of...
|
PDF Full Text Request